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Panhandle Renewable Energy Zone (PREZ) Study Preliminary Results ERCOT System Planning ERCOT CMWG

Panhandle Renewable Energy Zone (PREZ) Study Preliminary Results ERCOT System Planning ERCOT CMWG 09-04-2013. Outlines. Needs and Purpose of PREZ study Generation Interconnection in Panhandle Overview Study Process Preliminary Results Observation and Discussion. Needs of PREZ Study.

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Panhandle Renewable Energy Zone (PREZ) Study Preliminary Results ERCOT System Planning ERCOT CMWG

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  1. Panhandle Renewable Energy Zone (PREZ) Study Preliminary Results ERCOT System Planning ERCOT CMWG 09-04-2013 Preliminary Results

  2. Outlines • Needs and Purpose of PREZ study • Generation Interconnection in Panhandle Overview • Study Process • Preliminary Results • Observation and Discussion Preliminary Results

  3. Needs of PREZ Study • 2012 Long Term System Assessment • Significant expansion of wind resources in the Panhandle under a range of future outcomes. • If the northwestern-most portion of the Panhandle CREZ system becomes over-subscribed, voltage stability limits will constrain wind power delivery to the rest of the ERCOT system. • Generation projects will exceed the CREZ design capacity for the Panhandle area (based on the CREZ Reactive Study “Initial Build” recommendations). • No near-term Panhandle transmission projects being developed post CREZ 2013. Preliminary Results

  4. Purpose of PREZ Study • To identify system constraints and upgrades to accommodate future wind generation projects. • To provide a project roadmap for both ERCOT and TSPs to accommodate additional generation resources in the study area. • List of potential system upgrade projects. • Triggers for when those projects will be recommended. Preliminary Results

  5. Wind Projects GINR Overview Preliminary Results

  6. Signed Generation Interconnection Agreements in Panhandle (3489 MW as of July, 2013) *With financial commitment ** Projected commercial operation date Preliminary Results

  7. Panhandle Grid Characteristics • Minimal/no local load • Minimal/no sync generation • 11 GW wind capacity in GINR • Voltage stability and grid strength challenges Preliminary Results

  8. IA (2593 3489 MW) FIS Study (5409 5552MW) FIS-Complete (2450 1401 MW) Initial Build (2400 MW) Panhandle GINR Overview Updated March 8th, 2013, July, 2013 400 400 600 0 761 322 218 200 600 1100 200 0 500 600 361 400 149 Preliminary Results

  9. Study Process • Reliability Analysis • Steady state and dynamic stability analysis • SSWG 2016 HWLL base case • 8,946MW wind output, 36.5GW load • 0 MW in Panhandle • Two scenarios • 5,000 MW wind output in Panhandle • 7,500 MW wind output in Panhandle • Economic Analysis • 2017 UPLAN case from 2012 Five-Year Transmission Plan Preliminary Results

  10. Current Panhandle Design – 2,400 MW Gray Alibates Windmill Tule Canyon Tesla Ogallala Cotton Wood Dermott Long Draw Preliminary Results

  11. Scenario 1 Upgrades - 5 GW PREZ Windmill – Ogallala (1ckt, 27miles) Windmill – Alibates (1ckt, 93miles) Ogallala – Tule Canyon (1ckt, 47miles) Ogallala - Long Draw(2ckt, 200 miles) Condenser: WM (350 MVAr), OG (350 MVAr) Reactors: TC(150MVAr), OG(150MVAr), LD(100MVAr) Gray Alibates Windmill Ogallala Tule Canyon Tesla Cotton Wood Dermott Long Draw Preliminary Results

  12. Scenario 2 Upgrades - 7.5 GW PREZ: Option 1 345 kV projects Windmill – Ogallala (1ckt, 27miles) Windmill – Alibates (1ckt, 93miles) Ogallala – Tule Canyon (1ckt, 47miles) Condenser: WM , OG 345/500 kV projects Ogallala - Long Draw (2ckts, 200 miles) Gray-Riley(2ckts, 175 miles) Windmill-EdithClarke (2ckts, 175 miles) Gray Alibates Windmill Ogallala Tule Canyon Tesla Riley Edith Clarke Cotton Wood Graham Dermott Long Draw W. Shackelford Preliminary Results

  13. Study Progress In Service Signed Interconnection Agreement • Alibates-Windmill (345kV) • Windmill-Ogallala(345kV) • Ogallala-TuleCanyon(345kV) • Ogallala-LongDraw 2ckts • Synchronous Condensers and Reactors IA CREZ SC1 SC2 0 MW 3,489 MW 5,000 MW 7,500 MW 2,400 MW CREZ • 345/500 kV projects • Gray-Riley 2ckts • Windmill-EdithClarke 2ckts TBD Preliminary Results

  14. Notes • PREZ study focuses on the upgrade needs to increase Panhandle export capability. Other ERCOT regions may require further studies for potential thermal and stability challenges. • The identified upgrades may be revised base on the actual implementation of wind projects in Panhandle. • The upgrades identified in this study may still require RPG review. Preliminary Results

  15. Upgrades for PREZ Panhandle Load: 0MW Wind: 7.5GW SG: 0MW West Texas** Load: 2.9GW Wind: 7.6GW SG*: 2.7GW • Stability Constraint: • Voltage stability • Weak link • Low short circuit ratio • Controller challenge Existing link Identified Panhandle Upgrades *Include Comanche Peak units ** not include Panhandle Preliminary Results

  16. Upgrades for West Texas wind generation Panhandle Load: 0MW Wind: 7.5GW SG: 0MW West Texas** Load: 2.9GW Wind: 7.6GW SG*: 2.7GW ERCOT Load Centers • Stability Constraint: • Voltage stability • Low short circuit ratio • Voltage support for transfer Existing link Identified Panhandle Upgrades *Include Comanche Peak units ** not include Panhandle Further Upgrades? Preliminary Results

  17. Study Observation – Voltage Ride Through • Weak network conditions can cause transient overvoltage • Based on the modeled wind farms in the study, 973 MW wind capacity tripped due to transient overvoltage. • More capacity can be tripped that can even lead to high voltage collapse in the entire Panhandle area if wind farms are equipped with less voltage ride through capability. Panhandle 345kV Bus Voltage Response

  18. High Voltage Ride Through (HVRT): NOGRR 124 • Add HVRT base on PRC-024 (Adopted by the NERC Board of Trustees on May 9, 2013) • No change to the low voltage ride through requirement in Operating Guide 2.9.1

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